Business Segments (Tables)

3 Months Ended

Mar. 31, 2022

Segment Reporting [Abstract]

Financial Information Of Company Operating Segments

	Revenues
(In thousands)	Earned Premiums (1)		Investment Income		Other		Total (2)		Pre-Tax Income (Loss)		Net Income (Loss) to Common Stockholders
Three months ended March 31, 2022
Insurance	$	1,962,835	$	137,654	$	8,676	$	2,109,165	$	382,412	$	315,552
Reinsurance & Monoline Excess	286,252		27,423		—		313,675		57,628		47,080
Corporate, other and eliminations (3)	—		8,435		117,869		126,304		(73,872)		(59,817)
Net investment gains	—		—		366,265		366,265		366,265		287,823
Total	$	2,249,087	$	173,512	$	492,810	$	2,915,409	$	732,433	$	590,638
Three months ended March 31, 2021
Insurance	$	1,604,979	$	105,237	$	8,279	$	1,718,495	$	257,109	$	198,708
Reinsurance & Monoline Excess	244,977		37,708		—		282,685		68,649		54,471
Corporate, other and eliminations (3)	—		15,632		105,218		120,850		(64,529)		(52,606)
Net investment gains	—		—		34,839		34,839		34,839		28,952
Total	$	1,849,956	$	158,577	$	148,336	$	2,156,869	$	296,068	$	229,525

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(1) Certain amounts included in earned premiums of each segment are related to inter-segment transactions.

(2) Revenues for Insurance from foreign countries for the three months ended March 31, 2022 and 2021 were $235 million and $196 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign countries for the three months ended March 31, 2022 and 2021 were $96 million and $88 million, respectively.

(3) Corporate, other and eliminations represent corporate revenues and expenses that are not allocated to business segments

Identifiable Assets By Segment

(In thousands)	March 31, 2022		December 31, 2021
Insurance	$	25,057,202	$	24,403,918
Reinsurance & Monoline Excess	5,058,976		4,917,985
Corporate, other and eliminations	2,134,776		2,725,973
Consolidated	$	32,250,954	$	32,047,876

Net Premiums Earned By Major Line Of Business

Net premiums earned by major line of business are as follows:

	For the Three Months Ended March 31,
(In thousands)	2022		2021
Insurance:
Other liability	$	754,456	$	611,404
Short-tail lines (1)	375,212		324,740
Workers' compensation	285,423		267,449
Commercial automobile	282,234		220,761
Professional liability	265,510		180,626
Total Insurance	1,962,835		1,604,979
Reinsurance & Monoline Excess:
Casualty reinsurance	184,122		149,638
Property reinsurance	50,234		49,466
Monoline excess (2)	51,896		45,873
Total Reinsurance & Monoline Excess	286,252		244,977
Total	$	2,249,087	$	1,849,956

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(1) Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler and machinery and other lines.

(2) Monoline excess includes operations that solely retain risk on an excess basis.